1.What should be the purpose of her travel? - Spending time with daughter in UK, visiting and sightseeing UK
2.What should I enter in her accommodation?she will be staying with me. - you must state where she will be living during her stay in the UK, an invitation letter from yourself would suffice. State that she will be staying with you on the letter
Format of invitation letter :
http://www.immigrationboards.com/genera ... 51723.html
3.Should I attach my visa with her? Yes your visa copy (or BRP), Passport, copy, original employment / contract letter to prove your employment and salary, your UK bank statements and UK payslips (if you have this)
4. You will also need a letter from your property landlord stating that they have no problems with your mother living with you.
Format of letter :
http://www.liv.ac.uk/studentsupport/ist ... mplate.pdf
Apart from this she will also have to provide documents stated in Page 3 of below link (documents from mothers side)
https://www.gov.uk/government/uploads/s ... uments.pdf
If you are applying from India please see the below link which has detailed steps to follow,
http://www.vfsglobal.co.uk/India/how_to_apply.html